Analytics Dashboard - Net to Promoter

Hi All, 

Just wondering if anyone is able to assist with the following. 

Our organisation track sales by a net to promoter target. However, I've noticed that Analytics dashboards display revenue by gross / face value. Does anyone else know how this can be amended ala Ticket Sales by Period w/ Price Category filter 'Ticket Price'? Just trying to get some reporting automated. Relaxed

Cheers, 

Amy Welsh